I confess I'm having difficulty seeing everything. Check for solder bridges between wires, terminals, etc, on all pots and the jack. Use a magnifier to see clearly, and/or use a continuity or ohm meter to confirm or exclude.

Is a green wire from a pickup twisted around the shield material? If so, check that the green insulation hasn't melted from soldering.

If you can get in closer with the shots (maybe use a tripod?) it will be easier to examine.

I feel confident that you will get this sorted. Many issues arise from bridges, shorts, or grounding issues.

Bummer about the screws, by the way.

I routed around the cavity on my IB-5 so the cover sits flush. That was a nerve-wracking job!